Optically induced electrostriction modes in a nanoparticle of a uniformly charged electret

TL;DR

This paper models the optically induced electrostriction modes in charged electret nanoparticles, deriving spectral formulas for their oscillations and exploring their stability and potential as biolabels.

Contribution

It provides analytical spectral formulas for electrostriction oscillations in charged electret nanoparticles, highlighting their stability and application potential.

Findings

Analytic formulas for spheroidal and torsional oscillation frequencies.

Identification of stable electrostriction modes in charged nanoparticles.

Potential use of electret nanoparticles as biolabels.

Abstract

The electromagnetic response of a nanoparticle of an ion-doped polymeric elastic insulator, commonly called as an electret, is considered in the continuum model of a uniformly charged elastic sphere. The spectral formulae for the frequency of optically induced spheroidal and torsional shear oscillations driven by bulk force of elastic and dielectric stresses are obtained in analytic form. Particular attention is given to relaxation dielectric mode of the electrostriction response and its stability in the lowest quadrupole mode. The practical usefulness of ultrafine particles of electrets as a biolabels capable of accumulating likely-charged inclusions uniformly dispersed over the spherical volume of an elastic matrix is briefly discussed.